Mask



FIG. 1 is a front view of a mask showing our new design, in an extended configuration;

FIG. 2 is a left side view thereof, with the right side view being a mirror image thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is bottom view thereof;

FIG. 6 is an isometric view thereof;

FIG. 7 is a front view thereof, shown in a scrunched configuration;

FIG. 8 is a left side view thereof, with the right side view being a mirror image thereof;

FIG. 9 is a top view thereof;

FIG. 10 is a rear view thereof;

FIG. 11 is a bottom view thereof; and,

FIG. 12 is an isometric view thereof.

The broken lines shown in FIGS. 4 and 10 form no part of the claimed design. 

CLAIM The ornamental design for a mask, as shown and described. 